Mold.



V. 6. APPLE.

MOLD.

APPLICATION FILED MAYIY, 1918.

1 $84,553., Patented Nov. 12, 1918.

2 SHEETS-SHEET l.

V. G. APPLE.

MOLD.

APPLICATION FILED MAY 17, I918.

Patented Nov. 12,1918.

2 SHEETS-SHEET 2.

VINCENT G. APPLE, OF DAYTON, OHIO.

MOLD.

Specification of Letters Patent.

Patented Nov. 12, 1918.

Application and May 17, 1913. Serial No. 235,083.

To all whom it may concern:

Be it known that I, VINCENT G. APPLE, a citizen of the United States,residing at Dayton, in the county of Montgomery and State of Ohio, haveinvented certain new and useful Improvements in Molds, of which thefollowing is a specification. V

My invention relates to molds for plastic material and has especialreference to molds for insulating armatures, whereby to force a hot,plastic insulator into openings between and around the conductorsthat-have been temporarily supported on an armature core.

One of the objects of my invention is to provide a mold having suitable.matrices or grooves to receive an insulating material, capable of axialcontraction by apphcation of pressure, to force the material mto thespaces between electric conductors and to provide a suitable coating ofrefractory 1nsulation around the vulnerable parts of the armature andcommutator.

Another object of my invention is to provide an inner, armature holdingelement of the mold, insertible in the major part of the mold, and incotiperation therewith forming part of the matrices and by which thearma-' ture is independently supported.

Other and further objects of myinvention will become readily apparent topersons skilled in the art, from a consideration of the followingdescrlption when taken in conjunction with the drawings, wherein Figure1 is a central axial section of'the mold with an armature containedtherein and before pressure is applied.

Fig. 2 is a similar view showing the insulation pressed into the spacesbetween armature conductors and commutator sections and surrounding thevulnerable or conducting portions of the armature.

Fig. 3 is a plan view of the mold, in reduced size.

In all the views the same reference characters are employed to indicatesimilar parts. In the illustrative embodiment 5 is a spider of anarmature, sup orting the core 6 upon which conductors and 8 are properlyspaced apart and temporarily held on the armature core before the latteris inserted in the mold.

9 is the part where the conductors 7 and 8 are welded together afterwhich the parts 9 are welded to the commutator sections 10, re-

spectively. The commutator sections are also held temporarily spacedapart.

The two inner, separable members of the mold employed for holding thearmature in proper position, consists of the end plates 12 and 13,forming with the armature a composite piston, each concentrically boredfor a bolt 14. The bolt or shaft 14 passes through the plate 12 andthrough the hub 15 of the spider-5 and through an elongated hub 16 ofthe plate 13, the parts 12 and 13 being held closedly in contact withthe armature core 6, by the nut 17. The plate 12 is providedwith anannular-flange 18 which engages the adj acent surface of the armaturecore 6, and the plate 13 has a similar flange 19 which engages theopposite side of the armature core and which cooperates with thecylinder to provide a matrix space or annular opening 20, within whichto contain the insulation material 21. A quantity of similar insulationmaterial 22 is placed in the annular groove or matrix 23, which isformed in the inside surface of the head or ring 24. A cylinder 25 isshown to be separable from and secured to the ring 24: by any suitablemeans, screws 26 being shown for the purpose.

An annular ring plunger 27 fits neatly betweenthe inner surface of thecylinder 25 and the confronting surface of the flange 28 of the hub orplate 13. The plunger 27 is provided with a thickened portion on theinside, to form a shoulder 29, which will be brought into contact withthe shoulder 30 of the flange 28, and it is thickened on its outsidesurface to provide a shoulder 31 gor contact with the upper edge of thecylin= After the conductors 7 and 8 and the commutator sections 10 areproperly and temporarily spaced and held upon the core 6, the armatureis then ready for application of the insulation. The bolt 14 is thenpassed through the plate 12, through the hub 15 of the spider 5 andthrough the hub 16 of the plate 13 and the parts secured together by thenut 17. The piston plate 12 fits neatly inthe ring 24: of the head.Before placing the assembled partstogether the insulating material 22 isplaced in the annular groove or matrix 23, after which the armature withthe electric conductors 7 and 8, projecting rearwardlv from the rear endof the core, is suspended in the matrix 23, by placing the assembledpiston parts in the cylinder ing material, 21 and 22, is placed in themold, pressure is then applied to the plunger 27, and at the same timeheat is applied to the mold to soften the insulating material. Theeffect of the pressure and heat is to cause the insulating material 21and 22 to become more or less mobile, whereupon it is forced into thespaces in and around the conductors 7 and 8 and the core 6. When thepressure has caused the shoulders 29 and 30 and the shoulders 31 and 32to be brought substantially in contact, as clearly shown in Fig. 2, thesurrounding coating of insulating material, as at 35 and 86, is ofproper dimensions, and thereby all parts of the conductors are supportedand the vulnerable portions of the electrical conductors 7 and 8 areprotected. When suflicient heat and pressure have been applied to theinsulating material, within the mold, it is allowed to cool, whereuponthe insulation becomes hard and refractory and will not become softagain by application of heat of the same or greater temperature.

In Fig. 2 the annular grooves or matrices, 20 and 23, are shown filledwith the insulation 33 and 34 which has been pressed into place andcured.

After the insulation has cooled and the armature has been removed fromthe mold, it is then ready for operative use.

In the operation of the mold, the plates 12 and 13 serve as componentparts of a piston and are moved axially in the mold, proper, by theapplication of pressure, whereby the rear end of the armature is forcedinto the annular matrix near the bottom of the mold and whereby theinsulating material above the armature, in the space between the outersurface of the hub 13 and the inner surface of the cylinder 25, isforced into the matrix 20.

While I have herein shown and described a single embodiment of myinvention for the purpose of clear disclosure it is manifest, to personsskilled in the art, that many changes in the disposition andconfiguration of the naeaeae of an armature and commutator comprising 7a cylinder; a head in one end of the cylinder, having an annular grooveextending axially beyond the cylinder; means carried by the head forsupporting an armatureconcentrically within the cylinder so that thearmature windings at one end will extend into said groove; a hub at theother end of the armature of a size to leave an annular open ing betweensaid hub and cylinder and a piston in said opening.

2. A mold for forcing plastic insulating material between and around theconductors of an armature comprising a cylinder; a two-part head in oneend of the cylinder consisting of a ring secured thereto having anannular groove extending axially beyond the cylinder and an axiallymovable plate in said ring; means-carried by the plate for supporting anarmature concentrically within the cylinder so that the armaturewindings at one end will extend into the said groove when the plate andarmature are moved by the piston; a hub at the other end. of thearmature of a size to leave an annular opening between said hub andcylinder and a piston in said opening to move the armature axially ofthe cylinder and to force insulating material in the openings betweenthe conducting parts of the armature.

3. A mold for forcing plastic insulating material between and around theconductors of an armature, comprising a cylinder pro vided with a headat one end having a bore smaller than the cylinder and having an inneraxially extending groove between said bore and cylinder; a plate forattachment to an armature axially movable in said bore; a hub, smallerthan the bore of the cylinder attachable to the other end of thearmature; a bolt taking through the plate, armature and hub'to hold theparts together and a piston between the bore of the cylinder and thehub, axially movable to force insulating material around the conductingparts of the armature.

In testimony whereof I hereunto set my hand.

VINCENT G. APPLE.

